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Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements | | A.P. Serebrov
; V.G. Ivochkin
; R.M. Samoilov
; A.K. Fomin
; V.G. Zinoviev
; P.V. Neustroev
; V.L. Golovtsov
; A.V. Chernyj
; O.M. Zherebtsov
; M.E. Chaikovskii
; A.L. Petelin
; A.L. Izhutov
; A.A. Tuzov
; S.A. Sazontov
; M.O. Gromov
; V.V. Afanasiev
; M.E. Zaytsev
; A.A.Gerasimov
; V.V. Fedorov
; | | Date: |
9 May 2020 | | Abstract: | The experiment Neutrino-4 had started in 2014 with a detector model and then
was continued with a full-scale detector. All steps of preparatory work on this
experiment are presented. Were obtained the results of measurements of reactor
antineutrino flux and spectrum dependence on the distance in the range 6-12
meters from the center of the reactor core at SM-3 reactor (Dimitrovgrad,
Russia). Using all collected data, we performed the model independent analysis
on the oscillation parameters $Delta m_{14}^2$ and $sin^22 heta_{14}$. The
method of coherent summation of results of measurements allows us to directly
observe the effect of oscillations. We observed an oscillation effect at CL
$2.8sigma$ in vicinity of $Delta m_{14}^2 approx 7.25pm1.0 ext{eV}^2$ and
$sin^22 heta_{14}approx 0.26pm0.09(2.8)sigma$. We provide a comparison of
our results with results of other experiments on search for sterile neutrino.
Combining the result of the Neutrino-4 experiment and the results of
measurements of the gallium anomaly and reactor anomaly we obtained value
$sin^22 heta_{14} approx 0.19 pm 0.04 (4.6sigma)$. Also was performed
comparison of Neutrino-4 experimental results with results of other reactor
experiments NEOS, DANSS, STEREO, PROSPECT and accelerator experiments
MiniBooNE, LSND and results of the IceCube experiment. Mass of sterile neutrino
obtained from data collected in the Neutrino-4 experiment (in assumption
$m_4^2approx Delta m_{14}^2$) is $m_4=2.68pm0.13 ext{eV}$. Using the
estimations of mixing angles obtained in other experiments and our new results
we can calculate, within 3+1 neutrino model, masses of electron, muon, and tau
neutrinos: $m_{
u_e}^{ ext{eff}}=(0.58pm0.09) ext{eV},
m_{
u_mu}^{ ext{eff}}=(0.42pm0.24) ext{eV}, m_{
u_ au}^{ ext{eff}}leq
0.65 ext{eV}$. | | Source: | arXiv, 2005.5301 | | Services: | Forum | Review | PDF | Favorites | |
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